export default function () {
    //promise polyfill
    if (!window.Promise) {
        var Promise = require('promise-polyfill').default
        var setAsap = require('setasap')
        Promise._immediateFn = setAsap
        window.Promise = Promise
    }
    
    //Array.find polyfill https://tc39.github.io/ecma262/#sec-array.prototype.find
    if (!Array.prototype.find) {
        /* eslint-disable no-extend-native */
        Object.defineProperty(Array.prototype, 'find', {
            value: function (predicate) {
                // 1. Let O be ? ToObject(this value).
                if (this == null) {
                    throw new TypeError('"this" is null or not defined')
                }
                var o = Object(this)
                // 2. Let len be ? ToLength(? Get(O, "length")).
                var len = o.length >>> 0
                // 3. If IsCallable(predicate) is false, throw a TypeError exception.
                if (typeof predicate !== 'function') {
                    throw new TypeError('predicate must be a function')
                }
                // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
                var thisArg = arguments[1]
                // 5. Let k be 0.
                var k = 0
                // 6. Repeat, while k < len
                while (k < len) {
                    // a. Let Pk be ! ToString(k).
                    // b. Let kValue be ? Get(O, Pk).
                    // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
                    // d. If testResult is true, return kValue.
                    var kValue = o[k]
                    if (predicate.call(thisArg, kValue, k, o)) {
                        return kValue
                    }
                    // e. Increase k by 1.
                    k++
                }

                // 7. Return undefined.
                return undefined
            }
        })
    }
}